.map(sourceFolder -> sourceFolder.matching(filesFilter))
            .reduce(FileTree::plus)
            .orElse(projectLayout.files().getAsFileTree());
    }

    @TaskAction
    public void checkInvalidPatterns() throws IOException {
        Pattern allPatterns = Pattern.compile("(" + String.join(")|(", getPatterns().values()) + ")");
        List<String> failures = new ArrayList<>();
        for (File f : getFiles()) {